<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
	<head>
		<meta http-equiv="pragma" content="no-cache" />
		<meta http-equiv="cache-control" content="no-cache" />
		<meta http-equiv="Expires" content="0" />
		<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
		<title>Insert title here</title>
		<script type="text/javascript">
			// json的定义
			var jsonObj = {
				"key1": 12,
				"key2": "abc",
				"key3": true,
				"key4": [12, "arr", false],
				"key5": {
					"key5_1": 555,
					"key5_2": "key5_2_value"
				},
				"key6": [{
					"key_6_1_1": 444,
					"key_6_1_2": "key_6_1_2_value"
				},
				{
					"key_6_2_1": 234,
					"key_6_2_2": "key_6_2_2_value"
				}]
			};
			// json的访问
			// alert(typeof jsonObj);
			// alert(jsonObj.key1);
			// alert(jsonObj.key4);
			// alert(jsonObj.key6);
			// for (var i = 0; i < jsonObj.key4.length; i++) {
			// 	alert(jsonObj.key4[i]);
			// }
			// let key6 = jsonObj.key6[0];
			// alert(key6.key_6_1_1);

			// json对象转字符串
			let s = JSON.stringify(jsonObj);
			alert(s);

			// json字符串转json对象
			let parse = JSON.parse(s);
			alert(parse);

		</script>
	</head>
	<body>

	</body>
</html>